Exhaust hood



Aug 13, 1953 l. M. BAKER, JR 13,100,809

EXHAUST HOOD Filed Aug. 22, 1961 .2 shets-sheet 1 www Aug. 13, 1963 I. M. BAKER, JR

EXHAUST HOOD 2 Sheets-Sheet 2 FiledV Aug. 22, 1961 e m w W .aA/Mmm A@ INV ENTOR [JM mfez; ell:

ATTORNEYS United States Patent 3,100,809 EXHAUST HOOD Isaac M. Baker, Jr., 1323 Windsor Point Road, Norfolk, Va.

Filed Aug. 22, 1961, Ser. No. 133,102 3 Claims. (Cl. 261-16) This invention relates to exhaust hoods :for use in removing heat land dirt or `grease-.laden air from a designated area, usually a cooking area, :and particularly to exhaust -hoods which utilize liquid `sprays for cleaning the `air so removed.

It is common practice to place `a hood over a cooking area and, by means of a fan, draw air 'from the area and exhaust it to atmosphere, to prevent accumulation of heat in the area, and to remove `grease which may rise from the cooking utensils. With prior device, it has heen difiicult to get access to all interior parts of the hood for cleaning. Consequently, grease has accumulated in the hood, creating a ytire hazard `and frequently causing unpleasant odors.

The general object of the present invention is to provide an improved exhaust hood which will efficiently remove heated air and grease-laden air from the `area it is to serve.

A more specic object of the invention is to provide an exhaust hood which is constructed 4so that its interior structure may he readily removed for ease in cleaning and to provide ready access to all of the interior surfaces of the hood proper.

Another object is the pro-vision of -such a hood Where a washing fluid is used to scrub the air drawn into the hood to separate the grease :for collection, iso that no grease escapes into the stack )for entrapment.

A `further object is to provide a hood of this nature which is partially 4self-cleaning, to the extent that the air or gas washing liquid is caused Ito llow over the interior surfaces of the hood to wash them.

Yet another object of the invention is to provide an exhaust hood wherein a `supply of washing iluid will be available for cleaning the hood, without the necessity -for obtaining a supply -from another source.

Other objects of the invention will Ibecome apparent :from the following description of one practical embodiment thereof, when taken in conjunction with the drawings which accompany, and `form part of, this specification.

In the drawings:

FIGURE 1 is a iront elevational view of an exhaust hood incorporating the principles of the present invention;

FIGURE 2 is a top plan view of the exhaust hood;

`FIGURE 3 is :a somewhat diagrammatic view, showing the hood in side elevation and connected to a typical liquid supply system;

FIGURE 4 is .a vertical, transverse section through the hood, taken on the line l4 4 of FIGURE l and shown on an enlarged scale; and

FIGURE 5 is a detail `section `showing the removable liquid collection pans, and is taken on the line 5--5 of FIGURE 4.

In general, the invention contemplates an exhaust hood which has means for spraying liquid over ra path through which air is drawn, in order to remove the grease, or other dirt, `from the air. The sprayed liquid and con densate, together with removed grease, :are caught in removable collection pans and in a perimetral drain trough for delivery to a common outlet sump. The hood may be supplied with fresh air for mixture with dirty air to be cleaned, and as a means for entrainment of the 3,lll0,80i9 Patented Aug. 13, 1963 ICC .air to he cleaned, and .the spray liquid may carry a detergent, if desired.

Referring to the drawings in detail, the hood will be constructed upon a lframe 1, `which may include front and hack rectangular inem-bers 2 and 3, interconnected hy top bridge members 4. Sheet metal back plate 5, front plate 6, top plate 7, and end plates l8 .are hxed to the frame members to provide an outer housing having a bottom opening and a bottom edge 8a.

The top plate 7 is divided by spaced angle irons 9, which extend the length of the hood, to provide a longitudinal opening lll to receive the lower open end of an exhaust stack 1d. The stack has ideilector plates 12 along its lower longitudinal edges, and the two deilectors converge downwardly. A plurality of inclined struts 13 extend from the rear lower `edge of the :stack to the rear lower edge of the outer housing of the hood. A plate 1d is carried 'by the `struts to form the inner rear wall of the hood. Plate `14 terminates short of the bottom Wall of the hood, providing an elongated entrance port 15 for .auxiliary air. The rearward part of top plate 7, the back plate 5 land the plate 14 deiine an air manifold 16, Iand the port -15 fonms an outlet from the manifold extending the length of the hood. A suitable air inlet casing y17 `supplies air to the manifold. 'I'he `front inner Wall of the hood is stormed by a concavely curved plate 18, which has its rear edge at the |bottom edge of the [front detiector 12.

Along the bottom of the front inner wall, and along the side walls, there is an open perimetral trough l19 to collect spray, condensate `and grease which may run down the front and side walls. The trough opens at both ends to the ends of `a main trough 20 spaced adjacent the bottom edge of the hack plate 5 and which extends along the rear of the hood just to the fron-t, and below, the port 15. The main trough `slopes toward one end of the hood to provide for drainage, and the perimetral trough along the front wall slopes in the same direction. The legs of trough 19, along the side Walls, slope toward the main trough, Vso that complete drainage of the perimetral trough into the main trough will Ibe etfected. A :suitable drain pipe 21 will he `connected to the main ltrough at its low point.

There are a plurality of collection pans 22 and 2.3 within the hood, `arranged in sideaby-side relation the full length or" the hood. The pans ilie beneath the open bottom of stack 1-1 to catch liquid ifrom spray nozzles 24 attached to a liquid rsupply pipe line 25 Within the bottom of the stack 4and extending the horizontal length of the stack. The pans decline rearwardly to a position overlying the main trough 20, so that fluid lfalling on the pans will drain into the main trough. The pans are supported at their hase ends upon a rod 26, which is carried by hangers 27, mounted upon the iront inner 'wall 18. The 4rear ends of the pans rest upon an tangle iron 28 `which extends the length of trough 20. Brackets 29, hxed to the back inner wall 1i4 yand the iront Wall of trough v20, support angle iron 28.

Pans 22 and 23 `are identical insofar as both types have ilat bottoms 3l), vertical iside walls 31, an inclined Ifront wall 32 and declining rear .apron 33. The pans diier in that the side walls 31 of pans 23 are turned over at their tops to provide downturned flanges 34 spaced from the side walls, forming locking grooves to receive the tops :of the straight -side Walls of :adjacent pans 22. The pans are arranged lin side-byside position with pans 22 `and 23 alternating. Flanges 34 of pans 23 will overhang the side .walls of adjacent pans 22, so that the entire group will be intercoupled and there can he no transverse separat-ion of the pans.

Each pan carries a channel-shaped section 35 .along the front edge of the bottom. The sections 35 are beneath the pan bott-oms and open downwardly to straddle rod 26 and hold the pans in operative position. As the channels -x the pan positions, it is only necessary that the back ends of the pans rest upon the `angle `support 28. When the hood is in-stalled, a tan (not shown) will be located in stack y11, or at its outlet, to draw -f-rom the area beneath the hood, through the hood, and also draw an air supply through inlet casi-ng 17, air manifold 116 and air port ,15. Another fan` (not shown) rnay be used in inlet .1-7 to iforce air through port 15.

y It is contemplated that the hood will be incorporated in a liquid supply system which will provide constant 4 When it is desired to clean the hood, the pans 22 and 23 can be lifted `from their supports and removed. This leaves the enti-re interior of the hood open, so that all parts of it may be reached tor cleaning. Detergent liquid may be run through the trough vV, so that an Y ample supply will be directly available during cleaning.

recirculation of the liquid. Such a system is shown v diagrammatically in FIGURE 3. The liquid supply pipe 25 may be connected to a pump 36', located in the sump of a supply tank 37. VA detergent metering and density control 4device 38 will have Iits reed pipe 39 coupled to the supply tank 37, so that detergent will be supplied in proper proportion to, and pumped with, the liquid. Tank 37 may have a Ifresh liquid supply line 40, controlled by a lloat valve 41 to maintain the liquid at a constant level. The level will -be high enough to provide for a constant bleed-olf through outlet pipe 4,2. The -drain line 21 -from the exhaust hood main trough will empty into tank 37. Any grease returned to tank 37 by line 21 will float on the surface off the liquid in the tank and be carried oi through the bleed-olf through out-let pipe 42. The hood :supply line 25 will be valved, .as at `43, and a branch line 44 may be used, emptying into the perimetral trough 19. Line 44 will have a valve 45, so that liquid may be directed to the spray line 25 during general u-se of the hood, `and into the trough I19, and lfrom trough 19 to trough 20, to provide liquid supply when the hood is being cleaned.

In using the hood, it will be mounted horizontally on :an areal to be controlled. When the stack :tan is on, air will be drawn into and through the hood .and out stack -11, las previously described. Detergent :liquid #will be sprayed `from pipe `25, so that the entire entrance to the stackwill be covered and all air entering the stack must pass through .the spray. The spray will be controlled by -dellectors 12, so that it will fall into collection plates 2.2 `and 23, to drain into main trough 20 and be carried back to tank 37 for recirculation. Air passing through the detergent spray will .be scrubbed, so that grease and dirt will be removed and be carried olf with the spray.

When thercleaning operation is completed, it is an easy matter to re-seat the pans upon their supports with the ilanges 34 of pans 23 hooked `over the rupstanding sides of pans 22.

While in the above one practical embodiment of the invention has been disclosed, it will be understood that .the details of construction shown and described are merely by way of example, and the invention may take other .forms within the scope of the appended claims.

What is claimed is:

1. An exhaust hood comprising an enclosure having an open bottom and a bottom edge, a stack having an elongated opening communicating with the interior of said enclosure through the top thereof, a liquid spray pipe .in the stack adjacent the juncture of the enclosure and the stack, .a trough supported on the enclosure spaced adjacent -to a portion of the bottom edge, a plurality of removably mounted collection pans disposed in side by side relation supported on the enclosure directly beneath the stack opening along the length thereof and above the level of said trough, said pans each having a length at least equal to the width of said stack opening to catch the liquid ldischarged from the spray pipe, said pans declining toward the trough and having their lower edges overlying `at least a portion of said trough to permit the pans to dra-in into the trough and a liquid drain line trom the trough.

2. An exhaust hood as claimed in claim 1, wherein a second trough Vis-disposed adjacent and extends around the remaining portion of the bottom edge of the enclosure emptying into the rst named trough.

`E. An exhaust hood as claimed in claim l, wherein an auxiliary air manifold extends along the length of the enclosure having al port opening to the enclosure `adjacent the trough.

References`-Cited in theile of this patent i UNITED STATES PATENTS 2,681,182 McGrath June 15,V 1954 2,748,688 Smith June 5, 1956 2,788,954 Paasche Apr. y16, 1957 

1. AN EXHAUST HOOD COMPRISING AN ENCLOSURE HAVING AN OPEN BOTTOM AND A BOTTOM EDGE, A STACK HAVING AN ELONGATED OPENING COMMUNICATING WITH THE INTERIOR OF SAID ENCLOSURE THROUGH THE TOP THEREOF, A LIQUID SPRAY PIPE IN THE STACK ADJACENT THE JUNCTURE OF THE ENCLOSURE AND THE STACK, A TROUGH SUPPORTED ON THE ENCLOSURE SPACED ADJACENT TO A PORTION OF THE BOTTOM EDGE, A PLURALITY OF REMOVABLY MOUNTED COLLECTION PANS DISPOSED IN SIDE BY SIDE RELATION SUPPORTED ON THE ENCLOSURE DIRECTLY BENEATH THE STACK OPENING ALONG THE LENGTH THEREOF AND ABOVE THE LEVEL OF SAID TROUGH, SAID PANS EACH HAVING A LENGTH AT LEAST EQUAL TO THE WIDTH OF SAID STACK OPENING TO CATCH THE LIQUID DISCHARGED FROM THE SPRAY PIPE, SAID PANS DECLINING TOWARD THE TROUGH AND HAVING THEIR LOWER EDGES OVERLYING AT LEAST A PORTION OF SAID TROUGH TO PERMIT THE PANS TO DRAIN INTO THE TROUGH AND A LIQUID DRAIN LINE FROM THE TROUGH. 